﻿using System;
using System.Web;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Security;    
using System.Security.Cryptography.X509Certificates;


namespace Core.WeiXin
{
    /// <summary>
    /// http连接基础类，负责底层的http通信
    /// </summary>
    public class HttpService
    {

        public static bool CheckValidationResult( object sender , X509Certificate certificate , X509Chain chain , SslPolicyErrors errors )
        {
            //直接确认，否则打不开    
            return true;
        }
        public string Post2( string xml , string url )
        {
            return Post2( xml , url , false , 20 );
        }
        public string Post2( string xml , string url , bool isUseCert , int timeout )
        {
            System.GC.Collect();//垃圾回收，回收没有正常关闭的http连接

            string result = "";//返回结果

            HttpWebRequest request = null;
            HttpWebResponse response = null;
            Stream reqStream = null;

            try
            {
                //设置最大连接数
                ServicePointManager.DefaultConnectionLimit = 512;
                //设置https验证方式
                if( url.StartsWith( "https" , StringComparison.OrdinalIgnoreCase ) )
                {
                    ServicePointManager.ServerCertificateValidationCallback =
                            new RemoteCertificateValidationCallback( CheckValidationResult );
                }

                /***************************************************************
                * 下面设置HttpWebRequest的相关属性
                * ************************************************************/
                request = (HttpWebRequest)WebRequest.Create( url );

                request.Method = "POST";
                request.Timeout = timeout * 1000;

                //设置代理服务器
                //WebProxy proxy = new WebProxy();                          //定义一个网关对象
                //proxy.Address = new Uri(WxPayConfig.PROXY_URL);              //网关服务器端口:端口
                //request.Proxy = proxy;

                //设置POST的数据类型和长度
                request.ContentType = "text/xml";
                byte[] data = System.Text.Encoding.UTF8.GetBytes( xml );
                request.ContentLength = data.Length;

                //是否使用证书
                if( isUseCert )
                {
                    string path = WxPayConfig.RootPath;
                    X509Certificate2 cert = new X509Certificate2( path + WxPayConfig.SSLCERT_PATH , WxPayConfig.SSLCERT_PASSWORD );
                    request.ClientCertificates.Add( cert );
                    Log.Debug( "WxPayApi" , "PostXml used cert" );
                }

                //往服务器写入数据
                reqStream = request.GetRequestStream();
                reqStream.Write( data , 0 , data.Length );
                reqStream.Close();

                //获取服务端返回
                response = (HttpWebResponse)request.GetResponse();

                //获取服务端返回数据
                StreamReader sr = new StreamReader( response.GetResponseStream() , Encoding.UTF8 );
                result = sr.ReadToEnd().Trim();
                sr.Close();
            }
            catch( System.Threading.ThreadAbortException e )
            {
                Log.Error( "HttpService" , "Thread - caught ThreadAbortException - resetting." );
                Log.Error( "Exception message: {0}" , e.Message );
                System.Threading.Thread.ResetAbort();
            }
            catch( WebException e )
            {
                Log.Error( "HttpService WebException " , e.ToString() + e.Source + e.TargetSite + e.InnerException + e.StackTrace );
                if( e.Status == WebExceptionStatus.ProtocolError )
                {
                    Log.Error( "HttpService" , "StatusCode : " + ( (HttpWebResponse)e.Response ).StatusCode );
                    Log.Error( "HttpService" , "StatusDescription : " + ( (HttpWebResponse)e.Response ).StatusDescription );
                }
                throw new WxPayException( e.ToString() );
            }
            catch( Exception e )
            {
                Log.Error( "HttpService" , e.ToString() + e.Source + e.TargetSite + e.InnerException + e.StackTrace );
                throw new WxPayException( e.ToString() );
            }
            finally
            {
                //关闭连接和流
                if( response != null )
                {
                    response.Close();
                }
                if( request != null )
                {
                    request.Abort();
                }
            }
            return result;
        }
        public string Get2( string url )
        {
            System.GC.Collect();
            string result = "";

            HttpWebRequest request = null;
            HttpWebResponse response = null;

            //请求url以获取数据
            try
            {
                //设置最大连接数
                ServicePointManager.DefaultConnectionLimit = 512;
                //设置https验证方式
                if( url.StartsWith( "https" , StringComparison.OrdinalIgnoreCase ) )
                {
                    ServicePointManager.ServerCertificateValidationCallback =
                            new RemoteCertificateValidationCallback( CheckValidationResult );
                }

                /***************************************************************
                * 下面设置HttpWebRequest的相关属性
                * ************************************************************/
                request = (HttpWebRequest)WebRequest.Create( url );

                request.Method = "GET";

                //设置代理
                WebProxy proxy = new WebProxy();
                proxy.Address = new Uri( WxPayConfig.PROXY_URL );
                request.Proxy = proxy;

                //获取服务器返回
                response = (HttpWebResponse)request.GetResponse();

                //获取HTTP返回数据
                StreamReader sr = new StreamReader( response.GetResponseStream() , Encoding.UTF8 );
                result = sr.ReadToEnd().Trim();
                sr.Close();
            }
            catch( System.Threading.ThreadAbortException e )
            {
                Log.Error( "HttpService" , "Thread - caught ThreadAbortException - resetting." );
                Log.Error( "Exception message: {0}" , e.Message );
                System.Threading.Thread.ResetAbort();
            }
            catch( WebException e )
            {
                Log.Error( "HttpService" , e.ToString() );
                if( e.Status == WebExceptionStatus.ProtocolError )
                {
                    Log.Error( "HttpService" , "StatusCode : " + ( (HttpWebResponse)e.Response ).StatusCode );
                    Log.Error( "HttpService" , "StatusDescription : " + ( (HttpWebResponse)e.Response ).StatusDescription );
                }
                throw new WxPayException( e.ToString() );
            }
            catch( Exception e )
            {
                Log.Error( "HttpService" , e.ToString() );
                throw new WxPayException( e.ToString() );
            }
            finally
            {
                //关闭连接和流
                if( response != null )
                {
                    response.Close();
                }
                if( request != null )
                {
                    request.Abort();
                }
            }
            return result;
        }
        public static string Post( string xml , string url  )
        {
            return Post( xml , url , false , 20 );
        }
        public static string Post( string xml , string url , bool isUseCert , int timeout )
        {
            return new HttpService().Post2( xml , url , isUseCert , timeout );
        }
        /// <summary>
        /// 处理http GET请求，返回数据
        /// </summary>
        /// <param name="url">请求的url地址</param>
        /// <returns>http GET成功后返回的数据，失败抛WebException异常</returns>
        public static string Get( string url )
        {
            return new HttpService().Get2( url );
        }
        /// <summary>
        /// 创建HTTP请求
        /// </summary>
        public static string CreateHttpRequest(string url, string parameters, int timeout, string type)
        {
            var request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = type;
            request.ContentType = "application/x-www-form-urlencoded";
            request.Timeout = timeout * 1000;

            //如果需要POST数据
            if (!string.IsNullOrEmpty(parameters))
            {
                var data = Encoding.GetEncoding("utf-8").GetBytes(parameters);
                using (var stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
            }
            var response = (HttpWebResponse)request.GetResponse();
            using (var reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")))
            {
                return reader.ReadToEnd();
            }
        }
    }
}